1. Blackburn Coll 2/2 Reference (shelfmark): Blackburn Coll 2/2 Title: The Blackburn Collection of Oviedo Censor Marks Scope & Content: Front dated 6th December 1938, from Las Arriondas with a Heller (2000 Ed) A134.1 type censor mark. Collection Area: Philatelic Collections Languages: English Date Range: 6 Dec 1938 Extent: 1 Page; 1 Item